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https://www.readbyqxmd.com/read/28332409/laboratory-and-pilot-scale-field-experiments-for-application-of-iron-oxide-nanoparticle-loaded-chitosan-composites-to-phosphate-removal-from-natural-water
#1
Jae-Hyun Kim, Song-Bae Kim, Sang-Hyup Lee, Jae-Woo Choi
The aim of this study was to apply iron oxide nanoparticle-chitosan (ION-chitosan) composites to phosphate removal from natural water collected from the Seoho Stream in Suwon, Republic of Korea. Laboratory batch experiments showed that phosphate removal by the ION-chitosan composites was not sensitive to pH changes between pH values of 5.0 and 9.0. During six cycles of adsorption-desorption, the composites could be successfully regenerated with 5 mM NaOH solution and reused for phosphate removal. Laboratory fixed-bed column experiments (column height = 10 and 20 cm, inner diameter = 2...
March 23, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28324850/sludge-management-modeling-to-enhance-p-recovery-as-struvite-in-wastewater-treatment-plants
#2
N Martí, R Barat, A Seco, L Pastor, A Bouzas
Interest in phosphorus (P) recovery and reuse has increased in recent years as supplies of P are declining. After use, most of the P remains in wastewater, making Wastewater Treatment Plants (WWTPs) a vital part of P recycling. In this work, a new sludge management operation was studied by modeling in order to recover P in the form of struvite and minimize operating problems due to uncontrolled P precipitation in WWTPs. During the study, intensive analytical campaigns were carried out on the water and sludge lines...
March 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28324709/improvement-of-virus-removal-using-ultrafiltration-membranes-modified-with-grafted-zwitterionic-polymer-hydrogels
#3
Ruiqing Lu, Chang Zhang, Maria Piatkovsky, Mathias Ulbricht, Moshe Herzberg, Thanh H Nguyen
Potable water reuse has been adopted by cities suffering water scarcity in recent years. The microbial safety in water reuse, especially with respect to pathogenic viruses, is still a concern for water consumers. Membrane filtration can achieve sufficient removal of pathogenic viruses without disinfection byproducts, but the required energy is intensive. In this study, we graft-polymerized zwitterionic SPP ([3-(methacryloylamino) propyl] dimethyl (3-sulfopropyl) ammonium hydroxide) on a 150 kDa ultrafiltration polyethersulfone membrane to achieve a significantly higher virus removal...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28322467/a-new-strategy-for-accelerated-extraction-of-target-compounds-using-molecularly-imprinted-polymer-particles-embedded-in-a-paper-based-disk
#4
Mashaalah Zarejousheghani, Steffi Schrader, Monika Möder, Matthias Schmidt, Helko Borsdorf
In this study, a general simple and inexpensive method is introduced for the preparation of a paper-based selective disk-type solid phase extraction (SPE) technique, appropriate for fast and high throughput monitoring of target compounds. An ion exchange molecularly imprinted polymer (MIP) was synthesized for the extraction and analysis of acesulfame, an anthropogenic water quality marker. Acesulfame imprinting was used as an example for demonstrating the benefits of a nanosized, swellable MIP extraction sorbents integrated in an on-site compatible concept for water quality monitoring...
March 21, 2017: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/28320526/assessment-and-risk-modeling-of-airborne-enteric-viruses-emitted-from-wastewater-reused-for-irrigation
#5
D Courault, I Albert, S Perelle, A Fraisse, P Renault, A Salemkour, P Amato
Reclamation of wastewater (WW) for irrigation, after treatment represents a challenge that could alleviate pressure on water resources and address the increasing demand for agriculture. However, the risks to human health must be assessed, particularly those related to human enteric viruses that resist standard treatments in most wastewater treatment plants (WWTP). The risks associated with exposure to viral bioaerosols near WWTP and near agricultural plots irrigated with WW are poorly documented. The objectives of this study were to 1) better characterize human enteric viruses found in bioaerosols near a "standard WWTP" and over fields irrigated with treated WW and 2) propose a numeric model to assess the health risk to populations located close to the irrigated areas, with particular attention to norovirus, which is responsible for most viral gastroenteritis in France...
March 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28317444/development-of-a-high-rate-submerged-anaerobic-membrane-bioreactor-sanmbr
#6
I Mahmoud, W J Gao, B Q Liao, J Cumin, M Dagnew, Y Hong
Typically, anaerobic membrane bioreactors are operated at an organic loading rate (OLR) less than 10 kg COD/m(3)d. This paper discusses the development and performance of a high-rate submerged anaerobic membrane bioreactor (SAnMBR) for a high strength synthetic industrial wastewater treatment. An organic loading rate (OLR) as high as 41 kg COD/m(3).d was achieved with excellent COD removal efficiency (>99%). The membrane was operated at constant fluxes (9.4-9.9 ± 0.5 L/m(2).h) and the change in trans-membrane pressure was monitored to characterize the membrane performance...
March 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28317372/a-pillararene-based-aie-active-supramolecular-system-for-simultaneous-detection-and-removal-of-mercury-ii-in-water
#7
Hong-Bo Cheng, Ziyan Li, Yao-Dong Huang, Lei Liu, Hai-Chen Wu
Supramolecular polymers are polymers based on monomeric units held together with directional and reversible noncovalent interactions. Compared with traditional polymers, they possess better processability and better recycling properties, owing to their reversible monomer-to-polymer transition. Herein, we report the construction of a new supramolecular system through self assembly of a thymine-substituted copillar[5]arene 1 and a tetraphenylethylene (TPE) derivative 2 in the presence of Hg2+. Copillar[5]arene 1 can coordinate with Hg2+ tightly through T-Hg2+-T pairings...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28301973/beneficial-reuse-of-brest-harbor-france-dredged-sediment-as-alternative-material-in-road-building-laboratory-investigations
#8
Walid Maherzi, Mahfoud Benzerzour, Yannick Mamindy-Pajany, Eleanor Van Veen, Mohamed Boutouil, Edine Abriak Nor
ABSRACT The scarcity of natural aggregates promotes waste reuse as secondary raw material in the field of civil engineering. This article focuses on the beneficial reuse of marine dredged sediments in road building. Thus, mixtures of raw sediments and dredged sand collected from Brest Harbour (Bretagne, France) were treated with road hydraulic binders. Formulation were prepared and characterized as recommended by the French Technical Guidelines for soil treatment with lime and/or hydraulic binders. Mechanical resistance results are quite similar for the both hydraulic binders suggesting a similar reactivity with the studied sediment sample...
March 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28285214/domestic-wastewaters-reuse-reclaimed-by-an-improved-horizontal-subsurface-flow-constructed-wetland-a-case-study-in-the-southeast-of-spain
#9
Pedro Andreo-Martínez, Nuria García-Martínez, Joaquín Quesada-Medina, Luis Almela
The aim of this case study was to assess the performance of a horizontal subsurface flow constructed wetland (HF-CW) located in southeastern Spain, filled with blast furnace slags (BFS), planted with Phragmites australis and designed to treat artificially aerated domestic wastewater to produce effluents suitable for agriculture reuse. The water quality parameters, included in the Spanish regulations for reclaimed wastewater reuse as agricultural quality 2.1, were monitored for one year. Data for all studied parameters, except electrical conductivity (EC) and sodium adsorption ratio (SAR), met the Spanish standards for reclaimed wastewater reuse due to the high evapotranspiration (ET) during the summer...
February 28, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28283978/enhanced-levofloxacin-removal-from-water-using-zirconium-iv-loaded-corn-bracts
#10
Ying Yu, Wei Wang, Jing Shi, Siyi Zhu, Yachen Yan
The presence of antibiotics in the environment has attracted considerable attention due to their toxicity. In this study, agricultural waste corn bracts (CBs) modified by zirconium cations were utilized to remove levofloxacin (LEV) from wastewater. Zr-modified CBs exhibited a strong adsorption capacity (Qmax = 73 mg/g), and their desorption rate could reach 89% by simply adjusting the pH to 11. FTIR and XPS analyses indicated that the mechanism of LEV adsorption included the complexation between the ketone/carboxyl groups of LEV and the Zr atoms and the π-π electron-donor-acceptor interaction...
March 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28283934/biosorption-of-cu-2-and-ni-2-ions-from-synthetic-waters
#11
Sayiter Yıldız, Mehmet Çekim, Turgay Dere
In this study, biosorption of Cu(2+) and Ni(2+) ions to tobacco stalks was investigated under different operational conditions. The effects of the initial pH, ion concentrations, temperature, and duration of contact and adsorbent dosage were determined in the batch experiments. Chemical oxygen demand (COD) analyses were also performed to identify the possible negative effects of the sorbent throughout biosorption process. The sorption capacities of this sorbent were predicted by use of the equilibrium and kinetic models...
March 10, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28282572/performance-of-nitrogen-doped-graphene-aerogel-particle-electrodes-for-electro-catalytic-oxidation-of-simulated-bisphenol-a-wastewaters
#12
Zhuang Chen, Yimei Zhang, Lincheng Zhou, Hao Zhu, Fei Wan, Yue Wang, Dandan Zhang
The treatment of effluent containing Bisphenol A (BPA) was investigated experimentally using nitrogen-doped graphene aerogel (NGAs) as particle electrodes in a three-dimensional electrode reactor for the electrochemical treatment was studied. The effects of the cell voltage, pH, the ratio of NGAs mass to solution volume and repeated times on the removal efficiency were investigated. Compared with commercial carbon particle electrodes, the NGAs exhibited stronger activity to remove BPA simulated wastewater. For 15mgL(-1) of BPA solution, the degradation rate of BPA exceeded 90% after treatment for only 30min under the optimum conditions...
February 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28280287/electricity-and-catholyte-production-from-ceramic-mfcs-treating-urine
#13
Irene Merino Jimenez, John Greenman, Ioannis Ieropoulos
The use of ceramics as low cost membrane materials for Microbial Fuel Cells (MFCs) has gained increasing interest, due to improved performance levels in terms of power and catholyte production. The catholyte production in ceramic MFCs can be attributed to a combination of water or hydrogen peroxide formation from the oxygen reduction reaction in the cathode, water diffusion and electroosmotic drag through the ion exchange membrane. This study aims to evaluate, for the first time, the effect of ceramic wall/membrane thickness, in terms of power, as well as catholyte production from MFCs using urine as a feedstock...
January 19, 2017: International Journal of Hydrogen Energy
https://www.readbyqxmd.com/read/28278092/removal-of-acetaminophen-in-water-by-laccase-immobilized-in-barium-alginate
#14
Karnika Ratanapongleka, Supot Punbut
Acetaminophen (APAP) is a widely used analgesic drug. The quantities of acetaminophen excreted from human body via urine and feces are increasingly discharged into wastewaters from hospitals and household as well as found in wastewater from pharmaceutical production processes. This research has focused on the optimization of immobilized laccase condition and utilization in degradation of acetaminophen contaminated in aqueous. Laccase from Lentinus polychrous was immobilized in barium alginate. The effects of laccase immobilization such as sodium alginate concentration, barium chloride concentration and gelation time were studied...
March 1, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28272411/superior-adsorption-and-regenerable-dye-adsorbent-based-on-flower-like-molybdenum-disulfide-nanostructure
#15
Sancan Han, Kerui Liu, Linfeng Hu, Feng Teng, Pingping Yu, Yufang Zhu
Herein we report superior dye-adsorption performance for flower-like nanostructure composed of two dimensional (2D) MoS2 nanosheets by a facile hydrothermal method, more prominent adsorption of cationic dye compared with anodic dye indicates the dye adsorption performance strongly depends on surface charge of MoS2 nanosheets. The adsorption mechanism of dye is analyzed, the kinetic data of dye adsorption fit well with the pseudo-second-order model, meanwhile adsorption capability at different equilibrium concentrations follows Langmuir model, indicating the favorability and feasibility of dye adsorption...
March 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28259818/control-of-nitrification-denitrification-in-an-onsite-two-chamber-intermittently-aerated-membrane-bioreactor-with-alkalinity-and-carbon-addition-model-and-experiment
#16
Mahamalage Kusumitha Perera, James D Englehardt, George Tchobanoglous, Reza Shamskhorzani
Denitrifying membrane bioreactors (MBRs) are being found useful in water reuse treatment systems, including net-zero water (nearly closed-loop), non-reverse osmosis-based, direct potable reuse (DPR) systems. In such systems nitrogen may need to be controlled in the MBR to meet the nitrate drinking water standard in the finished water. To achieve efficient nitrification and denitrification, the addition of alkalinity and external carbon may be required, and control of the carbon feed rate is then important. In this work, an onsite, two-chamber aerobic nitrifying/denitrifying MBR, representing one unit process of a net-zero water, non-reverse osmosis-based DPR system, was modeled as a basis for control of the MBR internal recycling rate, aeration rate, and external carbon feed rate...
February 20, 2017: Water Research
https://www.readbyqxmd.com/read/28259624/stannic-chloride-impregnated-chitosan-for-defluoridation-of-water
#17
Shashikant Kahu, Anita Shekhawat, D Saravanan, Ravin Jugade
Chitosan, a potent amino polysaccharide, has been impregnated with Sn(IV) chloride for effective adsorption of fluoride from water. The Sn(IV) chloride impregnated chitosan was synthesized using microwave assisted technique. The material was thoroughly characterized using FTIR, SEM, EDX and XRD. The decrease in surface area and pore volume has been revealed from BET studies. Enhanced thermal stability of this material was ascertained by TGA-DTA studies. This Sn(IV) chloride impregnated chitosan(Sn-Ch) has been exploited for its defluoridation property...
March 1, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28257813/reverse-osmosis-and-ultrafiltration-for-recovery-and-reuse-of-larval-rearing-water-in-anopheles-arabiensis-mass-production-effect-of-water-quality-on-larval-development-and-fitness-of-emerging-adults
#18
Wadaka Mamai, Rebecca Hood-Nowotny, Hamidou Maiga, Adel Barakat Ali, Nanwintoun S Bimbile-Somda, Diloma Dieudonné Soma, Hanano Yamada, Rosemary Susan Lees, Jeremie R L Gilles
BACKGROUND: Countries around the world are showing increased interest in applying the sterile insect technique against mosquito disease vectors. Many countries in which mosquitoes are endemic, and so where vector control using the sterile insect technique may be considered, are located in arid zones where water provision can be costly or unreliable. Water reuse provides an alternate form of water supply. In order to reduce the cost of mass rearing of Anopheles arabiensis mosquitoes, the possibility of recycling and reusing larval rearing water was explored...
March 1, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28254718/clinoptilolite-and-palygorskite-as-sorbents-of-neutral-emerging-organic-contaminants-in-treated-wastewater-sorption-desorption-studies
#19
María Leal, Virtudes Martínez-Hernández, Raffaella Meffe, Javier Lillo, Irene de Bustamante
Water reuse for aquifer recharge could be an important route for the introduction of emerging organic contaminants (EOCs) into the environment. The installation of a Horizontal Permeable Reactive Barrier (H-PRB) could constitute a tertiary treatment process to remove EOCs from treated domestic wastewater prior to recharge activities. The sorption-desorption behaviour of six neutral EOCs present in treated domestic wastewater (acetaminophen, caffeine, carbamazepine, cotinine, 4-acetamidoantipyrine (4-AAA) and 4-formylaminoantipyrine (4-FAA)) has been evaluated...
May 2017: Chemosphere
https://www.readbyqxmd.com/read/28254048/removal-of-hexavalent-chromium-from-contaminated-waters-by-ultrasound-assisted-aqueous-solution-ball-milling
#20
Lin Chen, Zhenhua Chen, Ding Chen, Wei Xiong
Batch mode experiments were conducted to study the removal of hexavalent chromium (Cr(VI)) from aqueous solutions using ultrasound-assisted aqueous solution ball milling. The results show that the reduction rate of Cr(VI) by ultrasound-assisted aqueous solution ball milling was significantly faster than that by ball milling or ultrasound treatment alone, and an initial Cr(VI) concentration of 166mg/L could be decreased to 0.35mg/L at 120min. The decisive factors, including initial concentration of Cr(VI), pH value, ultrasonic frequency and filling gas, were studied...
February 2017: Journal of Environmental Sciences (China)
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